SM72240MF-4.63/NOPB National Semiconductor, SM72240MF-4.63/NOPB Datasheet - Page 8

• Manufacturer Part Number: SM72240MF-4.63/NOPB
• Description: Microprocesser Reset Circuit
• Manufacturer: National Semiconductor
• Series: SolarMagic™r
• Type: Simple Reset/Power-On Resetr

Specifications of SM72240MF-4.63/NOPB

• Number Of Voltages Monitored: 1
• Output: Open Drain or Open Collector
• Reset: Active Low
• Reset Timeout: 100 ms Minimum
• Voltage - Threshold: 4.63V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SC-74A, SOT-753
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

NEGATIVE-GOING V
TRANSIENTS
CC
The SM72240 is relatively immune to short negative-going
transients or glitches on V
.
Figure 2
shows the maximum
CC
pulse width a negative-going V
transient can have without
CC
causing a reset pulse. In general, as the magnitude of the
transient increases, going further below the threshold, the
maximum allowable pulse width decreases. Typically, a V
CC
transient that goes 125 mV below the reset threshold and
lasts 40 µs or less will not cause a reset pulse. A 0.1 µF by-
pass capacitor mounted as close as possible to the V
pin
CC
will provide additional transient rejection.
30141414
FIGURE 2. Maximum Transient Duration without Causing
a Reset Pulse vs. Reset Comparator Overdrive
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